Brush-holder for electrical machines.



PA E TED Him 26, 1906 R. SIEGPRIED & N. W STORER. BRUSH HOLDER FOR ELECTRICAL MAGHINES APPLICATION FILED $313.12, 1 904.

UNITED STAELLES,

PATENT OFFICE.

ROBERT SIEGF'RIEl) AND NORMAN W. STORER, OF PITTSBURG, PENNSYL- VANIA, ASSIGNORS TO WESTINGHOUSE ELECTRIC 6: MANUFACTURING COMPANY, A CORPORATION OF PENNSYLVANIA.

-BRU SHHOLDER FOR ELECTRICAL MACHlNES-.

' Specification of Letters Patent.

Patented June 26, 1906.

Application filed February 12,1904, Serial No. 193,355

cation.

Our invention relates to brush-holders for electrical machines; and it has for its object to rovide a device of this character which shal be adapted for use in connectionwith carbon-brushes; which shall be of simple, compact, and inexpensive construction, and which shall so operate as to obviate anyheeland-toe movement of the brush upon the commutator-cylinder.

In the accompanying drawin s, Figure 1 is a side elevation of a brush-hol er embodying our invention, certain portions being broken away; and Fig. 2 is a plan view of the holder.

As here shown and as preferably constructed, the frame 1 of the brush-holder comprises a casting 2 and a rolled-motal socket ortion 3, which is riveted to the casting. he casting is provided with a cylindrical opening 4 to receive asupporting-stud 5 and is also providedwith a slot 6, the two parts at the sides of the slot 6 being drawn together to clamp the casting to the stud by means of a screw 7. A carbon brush 8 is located and makes a loose sliding fit in the socket portion 3 and is provided at its outer end with a metal yoke 9, the said yoke being clamped to the brush by means of a bolt 10, its nut 10*, and a split Washer 10*. A strapmetal shunt 11 is connected at one end to the yoke 9 by means of the bolt 10 and a washer 12, and its other end is clamped to the casting 2 by means of athumb-nut 13.

Rotatably mounted in the upper end of the casting 2 is arod 14, the cylindrical portion of which is provided with a slot 16 to receive the inner end of a coil-spring 17. The outer end of the spring 17 projects to a point above the brush 8 and has riveted to it a block 18, which bears upon the upper side of the yoke 9.

In order to prevent back-and-forth m0Vcment of the block 18 by reason of the action of the commutator-cylinder upon the brush or by reason of vibrations of the machine, which are imparted to the spring, we provide an arm 19, comprising a U -shaped portion 20, the free ends of which are journaledupon the rod 14, and a portion 21,-which is riveted at an intermediate oint to the spring 17, as

indicated at 22. eyond the rivet 22 the strip is bent to form a hook or handle 23, which may be grasped by an attendant to raise the block 18 from the yoke 9 when desired. I

In order to provide for adjustment of the tension of the spring and for looking it in its adjusted position, we provide a thumb- Wrench in the form of a metal strip or bar 24, which is fastened in the slot 16 at the extended end of the rod 14 by means of a rivet 25. The unslotted end 27 of the rod 14 is provided with holes 26 at right angles to each other, and a corresponding hole 28 is provided in a boss 29, which is located on one side of the bracket 2, said holes being adapted to receive a cotter-pin 30 in order to prevent the rod 14 from turning during normal operation of the brush and its holder. The tension of the spring 17 may be adjusted manually by means ofthe thumb-wrench 2e when the cotter-pin 30 is removed, and when the desired adjustment has been eiiected the pin may be inserted in the hole 28and the one or the other of the holes 26 in order to lock the spring in its adjusted position. If the spring has a relatively large number of convolutions, the tension adjustment will be satisfactorily graduated, even though a quarter-turn of the rod 14 is made for each degree of adjustment.

If the shunt 11 should at any time become broken or if its electrical connections-to the brush or to the bracketshould become det will be observed that the brush-holder casting is if simple construction, that the rolled portipn 3 may be readily and cheaply formed land as readily and cheaplyrivete to the casting and that the entire combination is extremely simple, that the tension of the spring. may be quickly adjusted and the spring securely locked in its adjustedrelation and that there is no possibility of any movement of the free end of the spring and its block 18 except circumferentially with the axis of the rod 14 as a center, and consequently that the tendency to heel-and-toe action between the face of the brush and the commutator-cylinder, which tends to pro duce sparking, is avoided.

We claimas our invention 1. A brush-holder for electrical machines comprising a frame, a brush loosely su ported therein, a rod provided with a plurality of transverse holes rotatably mpunted'in bearings in said frame, one of which has a transverse hole, a spring having one end attached to said rod and its other end resting upon the brush, asteadying-arm loosely supported by said rod and rigidly attached to said s ring and a locking-pin that may be removab y inserted in the hole in the bearing and in either of the holes in the rod to lock the rod to the frame in each position to which it is rotatively adustcd.

2. I n a brush-holder, the combination with a frame having a socket and a brush having a sliding lit in said socket, of a s )iral spring having one end supported by said frameand having its other end resting upon said brush and a steadying-arm rigidly fastened to the spring and having one end pivotall y attached to the frame.

3. In a brush-holdenthe combination with a frame and a brush mounted to slide therein, of a spring, one end of which rests upon said brush and-the other end of which is attached tosaid frame, and a steadying-irrm rigidly fastened to said spring and pivotally attached to the frame.

4. lo a lnushholder, the combination with a frame and a brush loosely supported therein, of. a rod rotatably mounted in bearings in said frame, one of which has a transverse hole, said rod being provided with a thumbwrench and with a plurality of transverse holes each of whichimay be caused to register with the hole inthe bearing, a spring havingone end attached to said rod and its other end resting upon'the brush, a pivoted steady ingarni attached tosaid spring and a removable Milking-pin adapted to be inserted in either of the holes in the rod and in the hole in the frame.

5. In a brush-holder, the combination with a' frame and a brush loosely mounted therein, of a rod rotatably mounted in the frame, a s iral spring having one end attached to sai rod and the other end resting upon the brush, and a steadying-arm connecting said rod with an intermediate point in the sprin 6. In a brush-holder, the combination wit 1 a frame and a brush loosely mounted therein, of a rod journaled in said frame, a removable locking device between the rod and the frame, a spiral spring one end of which is fastened to said rod and the other end of which rests upon the brush and a steadying-arm having one end loosely mounted upon said rod and rigidly fastened to the spring between the rod and the brush.

7. In a brush-holder, the combination with a frame and a brush loosely mounted therein, of a rod journaled in said frame, 'a removable locking device between the rod and the frame, a spring having one end attached to the rod and having a block at its other end that rests upon the brush and a steadying-arm for the spring.

8. In a brush-holder, the combination with a frame com rising a casting and a sheetmetal socket for the brush, of a rotatable rod mounted in the casting, a removable locking device between the rod and the casting, a spiral spring attached to one end of the rod and a steadying-arm loosely mounted upon the rod and rigidly fastened to the free end of the spring.

9. In a brush-holder, the combination with a frame comprising a casting and a rolledmetal socket, of a brush loosely mounted in said socket, a rod rotatably mounted in the casting,'a removable locking device between the rod and the casting, a S)i18.l spring surrounding and fastened to sai rod and having a projecting end provided with a block to rest upon the brush and a stearlying-arm loosely connected at one end to said rod and rigidly fastened to the projecting portion of we the sprmg.

in testimony whereof we have hereunto subscribed our names this 5th day of February, 1904.

ROBERT SIICGPRIICI). NURMAN \V. SlOlt Eli. Witnesses:

(J. A. liner, Burner limits. 

